(b)
Phenol condenses with aliphatic and aromatic aldehydes in the $o$- and $p$-positions, the most important example being the condensation with formaldehyde. This is known as Leaderer-Manasse reaction
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.